Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)	12 Months Ended
	Mar. 29, 2020	Mar. 31, 2019	Apr. 01, 2018
Allowance for doubtful accounts:
Change in valuation allowances and reserves
Balance, beginning of period	$ 2,137,900	$ 1,094,900	$ 782,200
Provision/expense	2,100,400	1,721,200	797,100
Write-offs and other adjustments	(949,500)	(678,200)	(484,400)
Balance, end of period	3,288,800	2,137,900	1,094,900
Inventory Reserve:
Change in valuation allowances and reserves
Balance, beginning of period	5,870,600	5,739,700	6,360,600
Provision/expense	11,801,500	4,863,100	4,361,400
Write-offs and other adjustments	(8,006,000)	(4,732,200)	(4,982,300)
Balance, end of period	9,666,100	5,870,600	$ 5,739,700
Allowance for deferred tax asset:
Change in valuation allowances and reserves
Balance, beginning of period	141,600
Provision/expense	1,905,700	141,600
Balance, end of period	$ 2,047,300	$ 141,600